CA2695440C - Sand dewatering device and method - Google Patents
Sand dewatering device and method Download PDFInfo
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- CA2695440C CA2695440C CA2695440A CA2695440A CA2695440C CA 2695440 C CA2695440 C CA 2695440C CA 2695440 A CA2695440 A CA 2695440A CA 2695440 A CA2695440 A CA 2695440A CA 2695440 C CA2695440 C CA 2695440C
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- dewatering
- screen
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- weight
- vibratory
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- 239000004576 sand Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title description 13
- 239000000463 material Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 235000010755 mineral Nutrition 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- 230000010006 flight Effects 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 229910001204 A36 steel Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
- B30B9/128—Vertical or inclined screw presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
- B01D29/035—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting with curved filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
- B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/01—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons
- B01D33/03—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements
- B01D33/0346—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements with flat filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/28—Position of the filtering element
- B01D2201/287—Filtering elements with a vertical or inclined rotation or symmetry axis
Abstract
A dewatering device for aggregate products such as sand and gravel to allow dewatering to a moisture within the range of 8% by weight. This energy efficient dewatering system uses an inclined rotatably mounted dewatering screw (12) to initially dewater, followed by an associated vibratory dewatering screen (46) to achieve combined results that neither an inclined dewatering screw or a vibratory screen can achieve separately.
Description
TITLE: SAND DEWATERING DEVICE AND METHOD
FIELD OF THE INVENTION
The present invention relates to an apparatus for dewatering aggregate, commonly referred to as sand and gravel. It may of course be used for dewatering other materials, such as ore and minerals.
BACKGROUND OF THE INVENTION
In the processing and handling of aggregate materials such as sand, gravel or crushed stone, as well as in related industrial materials like coal, slag, iron ore, phosphate, potash, primary metal and related chemical industries, it is necessary to utilize relatively large quantities of water or other liquids in conjunction with or as a dispersing medium for finely sized solid particles produced in the respective grading, concentration or other process. At some point in the process, it is usually necessary to subsequently effect a separation or dewatering of these fine solid materials from the slurry containing them.
One method of dewatering fine granular material prior to disposing of the waste water or other liquid has been to subject the mixture to suitable dewatering devices. The most widely employed method for dewatering in the mineral aggregates industry is an inclined screw dehydrator which slowly moves the solid material up the incline of the screw thread out of a feed basin permitting back flow of the water to waste.
However, such equipment has limited water handling capacity and is plagued by the loss of valuable fines which are carried away in the back flow. Also, while such equipment only consumes an amount of energy, typically of 15 horsepower to dry 100 ton per hour to a level of 20% by weight to 25% by weight moisture, the moisture level remains high.
Another technique involves the use of centrifugal force to remove the free moisture.
However, the high cost, high power consumption, and wear characteristics associated with such a centrifuge apparatus have prevented the wide use of that technique on a commercial basis for handling abrasive materials. Similarly, the use of pressure or vacuum filters has not been commercially attractive, particularly for the sand and gravel and crushed stone industries.
Another common technique employed for dewatering fine particle slurries is the use of vibrating dewatering screens. The deck of these screens have often taken the form of finely woven wire cloth through which material may pass. Some have in recent times used urethane decks with small openings for water to pass. However the typical horsepower consumption of a dewatering screen system is high, i.e., 85 horsepower per 100 ton per hour, to achieve a moisture level of 8% by weight to 13% by weight; the typical vibratory dewatering screw, while it does dry to levels of moisture of from 8% by weight to 13% by weight, uses an 85 horsepower per 100 ton per hour power consumption. Moisture content may vary by particle size and mineral composition. The assignee of the current application manufactures both conventional dewatering screws and dewatering screens. As discussed, both have deficiencies, either high residual moisture or high power consumption to achieve low moisture.
As can be appreciated, the industry is constantly seeking improved methods for dewatering large quantities of fine solid slurries, particularly sand and gravel but not exclusively sand and gravel. Moreover, the industry is also seeking this improvement in ways which decrease moisture level efficiently with minimum power consumption.
Accordingly, it is a principle object of the present invention to provide a new and improved dewatering device which combines the advantages of an inclined rotatable screw and a vibratory dewatering screen, each designed so that they will cooperate together, i.e., co-act and provide a new and improved dewatering system that substantially increases the efficiency of the dewatering operation to achieve low moisture levels at lower power consumption cost.
Another object of the present invention is to provide a method of dewatering which achieves the above objective without the need of employing impractical and cost inefficient techniques such as centrifugal apparatus, pressure or vacuum filters, etc. The present device and method is uniquely suited, particularly for the sand and gravel and crushed stone industry, to provide lower cost effective dewatering.
A better understanding of the objects, advantages, features, properties and relationships of the component parts and the entirety of the invention will be obtained from the following detailed description and accompanying drawings which set forth an
FIELD OF THE INVENTION
The present invention relates to an apparatus for dewatering aggregate, commonly referred to as sand and gravel. It may of course be used for dewatering other materials, such as ore and minerals.
BACKGROUND OF THE INVENTION
In the processing and handling of aggregate materials such as sand, gravel or crushed stone, as well as in related industrial materials like coal, slag, iron ore, phosphate, potash, primary metal and related chemical industries, it is necessary to utilize relatively large quantities of water or other liquids in conjunction with or as a dispersing medium for finely sized solid particles produced in the respective grading, concentration or other process. At some point in the process, it is usually necessary to subsequently effect a separation or dewatering of these fine solid materials from the slurry containing them.
One method of dewatering fine granular material prior to disposing of the waste water or other liquid has been to subject the mixture to suitable dewatering devices. The most widely employed method for dewatering in the mineral aggregates industry is an inclined screw dehydrator which slowly moves the solid material up the incline of the screw thread out of a feed basin permitting back flow of the water to waste.
However, such equipment has limited water handling capacity and is plagued by the loss of valuable fines which are carried away in the back flow. Also, while such equipment only consumes an amount of energy, typically of 15 horsepower to dry 100 ton per hour to a level of 20% by weight to 25% by weight moisture, the moisture level remains high.
Another technique involves the use of centrifugal force to remove the free moisture.
However, the high cost, high power consumption, and wear characteristics associated with such a centrifuge apparatus have prevented the wide use of that technique on a commercial basis for handling abrasive materials. Similarly, the use of pressure or vacuum filters has not been commercially attractive, particularly for the sand and gravel and crushed stone industries.
Another common technique employed for dewatering fine particle slurries is the use of vibrating dewatering screens. The deck of these screens have often taken the form of finely woven wire cloth through which material may pass. Some have in recent times used urethane decks with small openings for water to pass. However the typical horsepower consumption of a dewatering screen system is high, i.e., 85 horsepower per 100 ton per hour, to achieve a moisture level of 8% by weight to 13% by weight; the typical vibratory dewatering screw, while it does dry to levels of moisture of from 8% by weight to 13% by weight, uses an 85 horsepower per 100 ton per hour power consumption. Moisture content may vary by particle size and mineral composition. The assignee of the current application manufactures both conventional dewatering screws and dewatering screens. As discussed, both have deficiencies, either high residual moisture or high power consumption to achieve low moisture.
As can be appreciated, the industry is constantly seeking improved methods for dewatering large quantities of fine solid slurries, particularly sand and gravel but not exclusively sand and gravel. Moreover, the industry is also seeking this improvement in ways which decrease moisture level efficiently with minimum power consumption.
Accordingly, it is a principle object of the present invention to provide a new and improved dewatering device which combines the advantages of an inclined rotatable screw and a vibratory dewatering screen, each designed so that they will cooperate together, i.e., co-act and provide a new and improved dewatering system that substantially increases the efficiency of the dewatering operation to achieve low moisture levels at lower power consumption cost.
Another object of the present invention is to provide a method of dewatering which achieves the above objective without the need of employing impractical and cost inefficient techniques such as centrifugal apparatus, pressure or vacuum filters, etc. The present device and method is uniquely suited, particularly for the sand and gravel and crushed stone industry, to provide lower cost effective dewatering.
A better understanding of the objects, advantages, features, properties and relationships of the component parts and the entirety of the invention will be obtained from the following detailed description and accompanying drawings which set forth an
2 illustrative preferred embodiment and are indicative of the way in which the principles of the invention can be employed.
BRIEF SUMMARY OF THE INVENTION
A dewatering device for aggregate products such as sand and gravel and ore and minerals, to allow dewatering to a moisture within the range of 8% by weight to 13% by weight at the rate of 100 tons per hour utilizing only 30 horsepower. This energy efficient dewatering system uses an inclined rotatably mounted dewatering screw to initially dewater, followed by an associated vibratory dewatering screen to achieve combined results that neither an inclined dewatering screw or a vibratory screen can achieve separately.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic of a side view of the dewatering device.
Figure 2 is a plan view of the device of Figure 1.
Figure 3 is a perspective view of the exit end of the dewatering screw at the entrance to the vibratory dewatering screen.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings in greater detail wherein like reference numerals indicate like parts throughout the several figures. The device or unit is referred to generally as 10.
Figure 1 is a schematic with parts broken away of a side view of the dewatering device 10 utilizing the features of the present invention. The dewatering device 10 is suitable for dewatering aggregate product, i.e., sand and gravel but may be used for dewatering other products such as minerals, ores, etc. Those of ordinary skill in the art appreciate this wider use and need no further description of alternative substrates with which this device may be used. As shown in Figure 1, the device 10 includes an inclined dewatering screw 12 contained within a housing 14 having a lower or entrance end 16 and bottom 20. The dewatering screw 12 is mounted on an incline within the housing, which is supported in its inclined position by legs 22.
BRIEF SUMMARY OF THE INVENTION
A dewatering device for aggregate products such as sand and gravel and ore and minerals, to allow dewatering to a moisture within the range of 8% by weight to 13% by weight at the rate of 100 tons per hour utilizing only 30 horsepower. This energy efficient dewatering system uses an inclined rotatably mounted dewatering screw to initially dewater, followed by an associated vibratory dewatering screen to achieve combined results that neither an inclined dewatering screw or a vibratory screen can achieve separately.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic of a side view of the dewatering device.
Figure 2 is a plan view of the device of Figure 1.
Figure 3 is a perspective view of the exit end of the dewatering screw at the entrance to the vibratory dewatering screen.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings in greater detail wherein like reference numerals indicate like parts throughout the several figures. The device or unit is referred to generally as 10.
Figure 1 is a schematic with parts broken away of a side view of the dewatering device 10 utilizing the features of the present invention. The dewatering device 10 is suitable for dewatering aggregate product, i.e., sand and gravel but may be used for dewatering other products such as minerals, ores, etc. Those of ordinary skill in the art appreciate this wider use and need no further description of alternative substrates with which this device may be used. As shown in Figure 1, the device 10 includes an inclined dewatering screw 12 contained within a housing 14 having a lower or entrance end 16 and bottom 20. The dewatering screw 12 is mounted on an incline within the housing, which is supported in its inclined position by legs 22.
3 Inclined dewatering screw 12 is rotatably mounted in conventional fashion at 24, 26. The dewatering screw flights 28 may have holes for bolts to hold an abrasion resistant liner (not depicted). At its upper end, dewatering screw 12 is operatively connected to motor 30 to allow rotational operation of dewatering screw 12. Motor 30 can vary in horsepower but generally is from 15 to 50. Housing 14 is open at 16 for entrance of sand and gravel 32, which drops to auger or dewatering screw 12.
In operation, sand and grave132 is delivered via opening 16 into the lower entrance end 16 wherein it falls to the bottom 20. Electric motor 30 operates to rotate dewatering screw 12 to convey sand and grave132 up the incline of the dewatering screw 12 via flights 28. Of course, the water drains back down as illustrated at water leve132 as the aggregate is conveyed up the incline.
Certain constructional features of the dewatering screw device 10 are worthy of mention for this importance of the combined unit. As earlier indicated, the motor 30 can have a horsepower within the range of from 15 to 50. The length of the dewatering screw 12 can vary but will generally be within the range from 20 feet to 35 feet with lengths at the shorter end of the range being most preferred. The angle of the inclined dewatering screw 12 can vary from about 15 above level to about 25 above level with 18 above level being most preferred for the incline.
The uniqueness of the combination of the present invention resides in the construction of the unit at the upper end or exit end 18 of housing 14 which allows the co-action of the dewatering screw portion and the vibratory screen portion.
The configuration of the exit end 18 of screw housing 14 and the beginning into vibratory portion 42 of the overall device 10 is best illustrated in Figures 2 and 3. At its exit end 18 screw housing 14 is welded to the horizontal housing of vibratory portion 42 to define the entrance to the vibratory housing 44. Screen 46 is mounted for linear and horizontal movement within vibratory housing 44. Motor mount 48 is mounted at its lower end to screen 46 and at its upper end to vibratory motors 50, 51. Coil springs 52, 54 are mounted to vibratory housing 44 and vibratory screen 46 to allow dewatering screen unit to vibrate when vibratory motors 50, 51 operate to initiate a linear and horizontal motion, moving the sand and gravel 32 whole particles towards the exit end 56 to further dewater.
The vibratory screen 46 may utilize a urethane deck with 1/4 mm apertures to allow the
In operation, sand and grave132 is delivered via opening 16 into the lower entrance end 16 wherein it falls to the bottom 20. Electric motor 30 operates to rotate dewatering screw 12 to convey sand and grave132 up the incline of the dewatering screw 12 via flights 28. Of course, the water drains back down as illustrated at water leve132 as the aggregate is conveyed up the incline.
Certain constructional features of the dewatering screw device 10 are worthy of mention for this importance of the combined unit. As earlier indicated, the motor 30 can have a horsepower within the range of from 15 to 50. The length of the dewatering screw 12 can vary but will generally be within the range from 20 feet to 35 feet with lengths at the shorter end of the range being most preferred. The angle of the inclined dewatering screw 12 can vary from about 15 above level to about 25 above level with 18 above level being most preferred for the incline.
The uniqueness of the combination of the present invention resides in the construction of the unit at the upper end or exit end 18 of housing 14 which allows the co-action of the dewatering screw portion and the vibratory screen portion.
The configuration of the exit end 18 of screw housing 14 and the beginning into vibratory portion 42 of the overall device 10 is best illustrated in Figures 2 and 3. At its exit end 18 screw housing 14 is welded to the horizontal housing of vibratory portion 42 to define the entrance to the vibratory housing 44. Screen 46 is mounted for linear and horizontal movement within vibratory housing 44. Motor mount 48 is mounted at its lower end to screen 46 and at its upper end to vibratory motors 50, 51. Coil springs 52, 54 are mounted to vibratory housing 44 and vibratory screen 46 to allow dewatering screen unit to vibrate when vibratory motors 50, 51 operate to initiate a linear and horizontal motion, moving the sand and gravel 32 whole particles towards the exit end 56 to further dewater.
The vibratory screen 46 may utilize a urethane deck with 1/4 mm apertures to allow the
4 user to dewater a broad range of particle sizes. Depending on the application, the opening can be up to lmm. The deck can handle up to approximately 14 inches of material depth, making use of the bottom layer material as a filter media. The dewatering screen may be constructed of high quality ASTM A36 structural steel.
The bed of the screen 46 has two angles. At the beginning it parallels the dewatering screw 12, but the end at the discharge point is horizontal. Dry sand and gravel moves out the exit 56 after the vibratory shaking of screen 46 caused by motors 50, 51.
Motion or vibration is supported by springs 52, 54.
Material that comes through the 1/4 mm screen 46 along with the water is collected in an under screen pan called an underflume 58. This water and fine sand mixture flows down hill (arrows 60) along the underflume 58 to its lowest end 62. At this point there is a gap in the tub around the dewatering screw 14. This sand and water flows back into the area of the dewatering screw. The water will overflow the back end of the washer and the fine sand will be pushed by the screw back onto the dewatering screen 46. The excess water flows out the back end of the screen via the belly pan (at 62).
The recycle of fine sand and grave132 which has traveled via directional arrow (Figure 3) up inclined screw 12 via its flights 28 and into vibratory screen 46, followed by fines dropping through underflume 58, via directional arrows 60 so that it is pushed back to the dewatering screw 12 for recycle back along the direction of arrow 33 is unique, and allows for the increased efficiency that exceeds that of a dewatering screw alone or a vibratory screen alone. As a result, energy efficiency and dewatering levels never before achieved with either device alone or simply added together in seriation are achieved.
Certain constructional features of the dewatering device portion 42 are worthy of mention. Dual vibratory motors 50, 51 can easily be set to increase vibratory intensity resulting in higher production and drier product if desired. Put another way, they are adjustable for the amount of acceleration desired. Generally 7.5 horsepower motors are satisfactory to provide this "g" force. The larger the screen 46, the greater the force required. The deck or vibratory screen size 46 can vary in width and length.
When used in combination with the dewatering screw portion 12 of the device 10 together they co-act to achieve from 8% by weight to 13% by weight dryness (comparable to dewatering screens) but at a much lower horsepower consumption than a dewatering screen system alone or a
The bed of the screen 46 has two angles. At the beginning it parallels the dewatering screw 12, but the end at the discharge point is horizontal. Dry sand and gravel moves out the exit 56 after the vibratory shaking of screen 46 caused by motors 50, 51.
Motion or vibration is supported by springs 52, 54.
Material that comes through the 1/4 mm screen 46 along with the water is collected in an under screen pan called an underflume 58. This water and fine sand mixture flows down hill (arrows 60) along the underflume 58 to its lowest end 62. At this point there is a gap in the tub around the dewatering screw 14. This sand and water flows back into the area of the dewatering screw. The water will overflow the back end of the washer and the fine sand will be pushed by the screw back onto the dewatering screen 46. The excess water flows out the back end of the screen via the belly pan (at 62).
The recycle of fine sand and grave132 which has traveled via directional arrow (Figure 3) up inclined screw 12 via its flights 28 and into vibratory screen 46, followed by fines dropping through underflume 58, via directional arrows 60 so that it is pushed back to the dewatering screw 12 for recycle back along the direction of arrow 33 is unique, and allows for the increased efficiency that exceeds that of a dewatering screw alone or a vibratory screen alone. As a result, energy efficiency and dewatering levels never before achieved with either device alone or simply added together in seriation are achieved.
Certain constructional features of the dewatering device portion 42 are worthy of mention. Dual vibratory motors 50, 51 can easily be set to increase vibratory intensity resulting in higher production and drier product if desired. Put another way, they are adjustable for the amount of acceleration desired. Generally 7.5 horsepower motors are satisfactory to provide this "g" force. The larger the screen 46, the greater the force required. The deck or vibratory screen size 46 can vary in width and length.
When used in combination with the dewatering screw portion 12 of the device 10 together they co-act to achieve from 8% by weight to 13% by weight dryness (comparable to dewatering screens) but at a much lower horsepower consumption than a dewatering screen system alone or a
5
6 PCT/US2008/051565 dewatering screw alone, i.e., successful operation can regularly be achieved at an average of 30 horsepower consumption per hour per 100 ton to achieve moisture levels of 8% by weight to 13% by weight. This has heretofore not been achievable at such low power consumption costs.
Moreover, it is important to realize that these results are achieved without the use of energy consuming pumps which have the disadvantage of increased energy consumption and wear to parts due to the high abrasion wear and tear caused by sand and gravel aggregate to the pumps. It is also important to note that the preferred screen used in the dewatering screen 46 is a two direction screen, meaning for a portion of its length at the beginning of the screen, it is parallel to the auger shaft. At approximately 1/3 of the way along, the screen bed becomes horizontal. Thus, achieving it's most efficient angle.
It is not known why this total unit 10 operates more efficiently than either portion alone, but it is believed to be the result of the unique arrangement of the exit end of the dewatering screw and entrance to the dewatering screen, namely use of the correct operating parameters including inclination angle of the dewatering screw, and its free association with the entrance end of the vibratory dewatering screen followed by the earlier described recycle. It is more efficient, due to the unique idea of reintroducing the minus 25mm material that escapes through the urethane screen cloth. This material is reintroduced to the dewatering screw just below the water line. This eliminates the need for expensive and energy intensive pumps and cyclones, closing the circuit.
Of course, we do not wish to be bound by the theory here presented, but it is set forth as one scientific explanation for the unique co-action here described to achieve the results here demonstrated.
Of course, once the sand and grave132 have been separated from the water 43, it can be placed into storage or immediately used, whichever is preferred or needed.
It is to be understood that the present invention is not limited by the preferred embodiment described above but encompasses the concept generically and all embodiments including those associated in the doctrine of equivalents if the law allows for falling within the scope of the following claims. The terms used herein are used without special meaning and are intended to encompass their plain ordinary language meaning of the words to one of skill in the art.
Moreover, it is important to realize that these results are achieved without the use of energy consuming pumps which have the disadvantage of increased energy consumption and wear to parts due to the high abrasion wear and tear caused by sand and gravel aggregate to the pumps. It is also important to note that the preferred screen used in the dewatering screen 46 is a two direction screen, meaning for a portion of its length at the beginning of the screen, it is parallel to the auger shaft. At approximately 1/3 of the way along, the screen bed becomes horizontal. Thus, achieving it's most efficient angle.
It is not known why this total unit 10 operates more efficiently than either portion alone, but it is believed to be the result of the unique arrangement of the exit end of the dewatering screw and entrance to the dewatering screen, namely use of the correct operating parameters including inclination angle of the dewatering screw, and its free association with the entrance end of the vibratory dewatering screen followed by the earlier described recycle. It is more efficient, due to the unique idea of reintroducing the minus 25mm material that escapes through the urethane screen cloth. This material is reintroduced to the dewatering screw just below the water line. This eliminates the need for expensive and energy intensive pumps and cyclones, closing the circuit.
Of course, we do not wish to be bound by the theory here presented, but it is set forth as one scientific explanation for the unique co-action here described to achieve the results here demonstrated.
Of course, once the sand and grave132 have been separated from the water 43, it can be placed into storage or immediately used, whichever is preferred or needed.
It is to be understood that the present invention is not limited by the preferred embodiment described above but encompasses the concept generically and all embodiments including those associated in the doctrine of equivalents if the law allows for falling within the scope of the following claims. The terms used herein are used without special meaning and are intended to encompass their plain ordinary language meaning of the words to one of skill in the art.
Claims (10)
1. A dewatering device for aggregate product, comprising:
a housing having an entrance end and an exit end;
an inclined dewatering screw rotatably mounted with said housing, and positioned below said entrance end; and a vibrator dewatering screen having an entrance and mounted with said housing adjacent said exit end of said housing for receipt of aggregate product that has passed through said dewatering screw;
said dewatering screw having an associated recycle system to recycle fines that have passed through the vibratory dewatering screen back to the dewatering screw;
and a vibrator motor or motors, mounted to linearly and horizontally move said dewatering screen.
a housing having an entrance end and an exit end;
an inclined dewatering screw rotatably mounted with said housing, and positioned below said entrance end; and a vibrator dewatering screen having an entrance and mounted with said housing adjacent said exit end of said housing for receipt of aggregate product that has passed through said dewatering screw;
said dewatering screw having an associated recycle system to recycle fines that have passed through the vibratory dewatering screen back to the dewatering screw;
and a vibrator motor or motors, mounted to linearly and horizontally move said dewatering screen.
2. The dewatering device of claim 1 which includes an exit and associated with said vibrator dewatering screen for exit of dewatered aggregate.
3. The device of claim 1 wherein the dewatering screen is a two directional screen so that the initial pass through material can be reintroduced to the dewatering screw.
4. The device of claim 1 wherein the aggregate product that leaves said dewatering screw is sand and has a moisture content of 15% by weight to 25% by weight.
5. The device of claim 4 wherein the aggregate product leaving the dewatering screen has a moisture content of from about 8% by weight to about 13% by weight.
6. The dewatering device of claim 5 wherein the dewatering screw is from about 20 feet in length to about 35 feet in length.
7. The dewatering device of claim 5 wherein the dewatering screen is from about 6 foot in length to about 12 foot in length.
8. The dewatering device of claim 1 wherein the dewatering screw is mounted at an angle of from 15 ° to 25 ° above horizontal.
9. The dewatering device of claim 8 wherein the dewatering screw is mounted at 18 ° above horizontal.
10. The device of claim 1 which uses 30 horsepower to dewater 100 tons of aggregate/hour to a moisture level of from about 8% by weight to about 13% by weight.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/849,626 | 2007-09-04 | ||
| US11/849,626 US8695804B2 (en) | 2007-09-04 | 2007-09-04 | Sand dewatering device and method |
| PCT/US2008/051565 WO2009032356A1 (en) | 2007-09-04 | 2008-01-21 | Sand dewatering device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2695440A1 CA2695440A1 (en) | 2009-03-12 |
| CA2695440C true CA2695440C (en) | 2012-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CA2695440A Expired - Fee Related CA2695440C (en) | 2007-09-04 | 2008-01-21 | Sand dewatering device and method |
Country Status (9)
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| US (1) | US8695804B2 (en) |
| EP (1) | EP2188116B1 (en) |
| CA (1) | CA2695440C (en) |
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| ES (1) | ES2558382T3 (en) |
| MX (1) | MX2010002378A (en) |
| PL (1) | PL2188116T3 (en) |
| PT (1) | PT2188116E (en) |
| WO (1) | WO2009032356A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1400509B1 (en) * | 2010-06-22 | 2013-06-11 | Stradi | EQUIPMENT AND METHOD FOR THE DEHYDRATION OF SLUDGE DEHYDRATION TREATMENT. |
| US9227849B2 (en) * | 2012-07-24 | 2016-01-05 | Bio Techno Terra, LLC | Systems and methods for processing sylvinite and carnallite ores |
| US10118358B2 (en) * | 2014-12-22 | 2018-11-06 | Us Farm Systems, Inc. | Screw press for separation of liquid from bulk materials |
| RU2580736C1 (en) * | 2014-12-29 | 2016-04-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный аграрный университет" | Vibration machine for dewatering loose materials |
| RU2580730C1 (en) * | 2014-12-29 | 2016-04-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный аграрный университет" | Compact installation for dewatering of loose materials |
| US9651307B2 (en) | 2015-02-26 | 2017-05-16 | Superior Industries, Inc. | System, methods, and apparatus for aggregate dewatering |
| RU2591959C1 (en) * | 2015-04-23 | 2016-07-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный аграрный университет" | Vibratory plant for dewatering of loose materials |
| CN105413286B (en) * | 2015-11-26 | 2017-08-25 | 桐城市雨润生物科技有限公司 | A kind of blood processes automatic filtering system |
| CA2967880C (en) | 2016-05-20 | 2023-03-21 | Superior Industries, Inc. | Aggregate attrition systems, methods, and apparatus |
| US11565271B2 (en) | 2016-06-16 | 2023-01-31 | Superior Industries, Inc. | Aggregate washing systems, methods and apparatus |
| USD892279S1 (en) | 2017-03-22 | 2020-08-04 | E-Z Products Llc | Gutter cover |
| USD873305S1 (en) | 2017-05-19 | 2020-01-21 | Superior Industries, Inc. | Attrition mill propeller |
| US10486383B1 (en) * | 2018-12-18 | 2019-11-26 | V.Y.F. Express Inc. | Screw press having screen vibration |
| US10343847B1 (en) | 2018-12-18 | 2019-07-09 | V.Y.F. Express Inc. | Manure screw press having screen vibration |
| CN111544936A (en) * | 2020-05-13 | 2020-08-18 | 泉州市亚创科技有限公司 | Sewage treatment plant for municipal works |
| US11890782B2 (en) | 2020-06-05 | 2024-02-06 | Vermeer Manufacturing Company | Mixing systems having disk assemblies |
| USD934396S1 (en) | 2020-08-13 | 2021-10-26 | E-Z Products Llc | Gutter cover |
| US11850603B2 (en) | 2021-01-04 | 2023-12-26 | Superior Industries, Inc. | Aggregate washing systems, methods, and apparatus |
| CN114904827A (en) * | 2022-05-14 | 2022-08-16 | 洛阳隆中重工机械有限公司 | High-efficient ore sand desliming equipment |
| CN115921421A (en) * | 2022-11-23 | 2023-04-07 | 昆明理工大学 | Equipment for simultaneously desliming and dehydrating quartz sand for casting |
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| US3398676A (en) | 1963-08-20 | 1968-08-27 | Harry A. Theobald | Apparatus and method for rendering animal materials |
| US3970549A (en) | 1973-06-18 | 1976-07-20 | Linatex Corporation Of America | Screen assembly and dewatering technique |
| US4113626A (en) | 1975-09-19 | 1978-09-12 | The Black Clawson Company | Dewatering screen |
| DE2649376A1 (en) | 1975-11-04 | 1977-05-12 | Terence Charles Adams | METHOD OF MANUFACTURING A SCREEN |
| US5552044A (en) * | 1991-07-15 | 1996-09-03 | Abel; Gunther | Apparatus for separating solid material and liquid |
| DE4314673C1 (en) | 1993-05-04 | 1994-05-19 | Huber Hans Gmbh | Worm drive axis - is positioned above and at a distance from the axis of the surrounding rotating sepn. surface |
| US5489383A (en) * | 1993-06-16 | 1996-02-06 | Hitachi Zosen Corporation | Screw type dewatering machine |
| DE9311011U1 (en) | 1993-07-23 | 1993-10-28 | Preus Helmut Dipl Ing | Worm screen press |
| US5950936A (en) * | 1998-01-21 | 1999-09-14 | Bergart; David | Process and system for recycling glass |
| US6000645A (en) | 1999-01-27 | 1999-12-14 | Bfk Technologies, Inc. | Axial flow, bi-rotor concrete reclaimer |
| CA2412613A1 (en) | 2002-11-22 | 2004-05-22 | Mcn Bioproducts Inc. | Filtration of viscous oilseed slurries |
| DE102005019243A1 (en) | 2005-04-26 | 2006-11-09 | Fan Separator Gmbh | Helical malt press holds back separating fluid temporarily behind weir retaining helix below liquid surface |
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- 2008-01-21 DK DK08713874.9T patent/DK2188116T3/en active
- 2008-01-21 ES ES08713874.9T patent/ES2558382T3/en active Active
- 2008-01-21 CA CA2695440A patent/CA2695440C/en not_active Expired - Fee Related
- 2008-01-21 PT PT87138749T patent/PT2188116E/en unknown
- 2008-01-21 EP EP08713874.9A patent/EP2188116B1/en not_active Not-in-force
- 2008-01-21 MX MX2010002378A patent/MX2010002378A/en active IP Right Grant
- 2008-01-21 PL PL08713874T patent/PL2188116T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP2188116B1 (en) | 2015-12-23 |
| MX2010002378A (en) | 2010-03-22 |
| ES2558382T3 (en) | 2016-02-03 |
| WO2009032356A1 (en) | 2009-03-12 |
| US20090057204A1 (en) | 2009-03-05 |
| PL2188116T3 (en) | 2016-03-31 |
| PT2188116E (en) | 2016-02-04 |
| DK2188116T3 (en) | 2016-01-18 |
| EP2188116A1 (en) | 2010-05-26 |
| US8695804B2 (en) | 2014-04-15 |
| CA2695440A1 (en) | 2009-03-12 |
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